diff --git a/toonz/sources/toonzlib/toonzscene.cpp b/toonz/sources/toonzlib/toonzscene.cpp
index 8fdeff3..5dab4bb 100644
--- a/toonz/sources/toonzlib/toonzscene.cpp
+++ b/toonz/sources/toonzlib/toonzscene.cpp
@@ -172,7 +172,7 @@ void deleteUntitledScene(const TFilePath &fp) {
 
 static void saveBackup(TFilePath path) {
   try {
-    TFilePath backup = path.withName(path.getName() + "_backup");
+    TFilePath backup = path.withType(path.getType() + ".bak");
     if (TSystem::doesExistFileOrLevel(backup))
       TSystem::removeFileOrLevel_throw(backup);
     TSystem::copyFileOrLevel_throw(backup, path);
diff --git a/toonz/sources/toonzlib/txshsimplelevel.cpp b/toonz/sources/toonzlib/txshsimplelevel.cpp
index 8b5bac1..272574e 100644
--- a/toonz/sources/toonzlib/txshsimplelevel.cpp
+++ b/toonz/sources/toonzlib/txshsimplelevel.cpp
@@ -1375,7 +1375,7 @@ void TXshSimpleLevel::save() {
 
 static void saveBackup(TFilePath path) {
   try {
-    TFilePath backup = path.withName(path.getName() + "_backup");
+    TFilePath backup = path.withType(path.getType() + ".bak");
     if (TSystem::doesExistFileOrLevel(backup))
       TSystem::removeFileOrLevel_throw(backup);
     TSystem::copyFileOrLevel_throw(backup, path);